I don’t.
If it’s worth anything, I also tried downloading a file directly from Plex remotely and it also downloaded around the few Mbps rate (compared to 150Mbps~ with a local download from the server).
Would you mind sharing a library with me so I can test from my end?
Nothing personal, but I would prefer to not, but it might come to it 
I created a new log file with a different video playing – at 8 Mbps. Something I noticed that is very interesting is that one video usually plays fine at 1.5 Mbps while another struggles at 1.1 Mbps and needs to be run at 0.7 Mbps (both are on the same drive and there is only ever the single stream running at a given time).
It all seems a bit odd to me as I don’t think anything changed between the years when it worked fine and the last couple of months when it’s been a problem.
P.s. would the ‘optimize database’ potentially do anything?
Actually, I think I figured out the issue.
I remembered that I did move things around on my home network a while back – I moved something from the main network onto a secondary guest network and apparently the QoS in place on the network as a whole doesn’t touch the guest network. With a separate QoS enabled on the guest network it seems to be completely solved.
Ah yes. QoS. The good and bad traffic cop of networking.
Yep. I’m still not sure why the master QoS doesn’t control the guest network’s QoS, but whatever. It’s working now.
So, thanks 
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